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Table of Contents
Title
Dry Ice Sublimation
Problem Scenario
I want to know is there is a better substance to sublimate dry ice.Broad Question
Which liquid makes dry ice sublimate at a lesser rate?Specific Question
Does dry ice sublimate at a quicker rate in water, alcohol, oil or salt water?Hypotheses
The more dense the liquid, the slower dry ice will sublimate.Graph of Hypothesis
Variables
Independent Variable:
The different liquids used to melt the dry ice.Dependent Variable:
The sublimating time.Variables That Need To Be Controlled:
The amount of liquid to test.The amount of dry ice being tested.
Vocabulary List That Needs Explanation
Dry Ice- Is a solid form of carbon dioxide and is used to refrigerate things.Sublimate- To sublimate means making a solid substance turn into a gas.
Liquid- A liquid is something they has many molecules. They move freely and stay together.
General Plan
First I'm going to get the four different liquids to sublimate the dry ice in. I have to get water, air, oil, and salt water.Then I will put the dry ice into each liquid and time the rate that it sublimates in the liquid.
Potential Problems And Solutions
How do you see when the dry ice is done sublimating?Put a fan on it then it will blow all the fog away from your beaker.
Safety Or Environmental Concerns
Dry ice can burn your skin if you touch it.Experimental Design
(add the correct headings from the experimental design pagebefore beginning)Resources and Budget Table
Detailed Procedure
1.First you have to get four of the same size cup.2.Then in each cup you have to put 200 ml of each liquid you will be testing with (water, salt water, oil, alcohol).
3. After you have to put Oil in one cup.
4. Then alcohol in another cup.
5.Next cup has to has salt water in it.
6. And then get a cup with regular water.
7. Put in about a teaspoon of dry ice in each liquid 5kg.
8.Time the amount of time for each liquid to sublimate the dry ice
9. Don't forget to take pictures while you're doing your experiment!
10. Record the time it takes for each one to sublimate into a rough draft of a data table.
11. Do this 3 more times and record the data.
Photo List
I will take photos of my experiment. The dry ice in the oil to water to salt water to achohol.Time Line
February 6th- finish wiki page.February 10th- Start experiment.
February 10th- collect data.
Data Table
Data Analysis
All Raw Data
1Photos
Results:
In the end the liquid that sublimated the dry ice in the time was salt at 2 minutes and 22 seconds.Then was the regular water at 2 minutes and 42 seconds.
The next time was alcohol at 3 m minutes and 45 seconds.
The last time that took the longest to sublimate the dry ice was 7 minutes and 0.5 seconds.
Conclusion Based on the data I collected I concluded that the less dense the liquid is the faster it will sublimate the dry ice. this disproves my Hypothesis.
Discussion
While doing my project I found out which liquids sublimates dry ice that fastest. The first thing I tested was Oil. The dry ice took at least 7 minutes to sublimate in the oil. This is because the oil was the thickest liquid. The I tested the dry ice in Alcohol. Alcohol took the second longest to sublimate. It took about 4 minutes. Then I tested water. The water took about 3 minutes. Over all I think I did a good job and collected good data.Benefit to Community and/or Science
The benefit is that it is a fun way to test sublimation.It also shows what kind of cooling agent it could be.
Background Research
Dry ice is a solid form of carbon dioxide.People use dry ice as a cooling agent.
Dry ice is like normal ice but it doesn't leave any liquid behind. It can be use to preserve frozen foods and ice cream.. etc.
Dry ice was first found in 1834 my the French.
Dry ice is so cold it gets to -109 degrees
References
http://en.wikipedia.org/wiki/Dry_iceAbstract
DRY ICE SUBLIMATION
I first thought of my question when we did a project about dry ice ion science class. Based on what we did in class with dry ice I decided that I wanted to do my Science Fair project on sublimating dry ice. At first I thought that the more thick the liquid the faster the dry ice would sublimate. Well after collecting all of my data I found that the less dense the liquid was the faster the sublimation time would be, I tested my question by taking one liquid and timing how fast a certain amount of dry ice would sublimate. I'm also put a fan to blow off the steam so I would know I would be getting the exact sublimation time. I tested my method 3 different times. In my results reach time I would get about the same time for each liquid in each trail I did. In the end of my project I concluded the my Hypothesis was wrong. In the end after I put my data into a graph I found that the Salt Water sublimated the dry ice in the least amount of time. The liquid that took the longest to sublimate the dry ice was the Oil. I think that I did a good job on this experiment.